# Ncert Science Class 10 Solutions Chapter 12

## Ncert Science Class 10 Solutions Chapter 12 Magnetic Effects of Electric Current

Welcome to NCTB Solutions. Here with this post we are going to help 10th class students for the Solutions of NCERT Class 10 Science Book Chapter 12, Magnetic Effects of Electric Current. Here students can easily find step by step solutions of all the questions in Magnetic Effects of Electric Current. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 12 solutions. Here all Question Answer are based on NCERT latest syllabus.

Magnetic Effects of Electric Current Exercise question Solutions :

(1) Which of the following correctly describes the magnetic field near a long straight wire?

Correct option – (a)

The consists of concentric circles centred on the wire.

(2) At the time of short circuit, the current in the circuit

Correct option – (c) increases heavily.

At the time of short circuit, the current in the circuit increases heavily due to increased current in the circuit shorts.

(3) State whether the following statements are true or false.

(a) The field at the centre of a long circular coil carrying current will be parallel straight lines.

= This statement is True.

(b) A wire with a green insulation is usually the live wire of an electric supply.

= This statement is False.

= Because a wire with a red insulation is usually the live wire of an electric supply.

(5) When is the force experienced by a current–carrying conductor placed in a magnetic field largest?

Displacement or magnitude of the force on the current carrying conductor is largest when the direction of the current is at right angles to the direction of magnetic field. This arrangement is discussed as Fleming’s left hand rule.

(6) Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Vertical downward, by using Fleming’s left hand rule, The direction of current in beam is from back wall to front wall. The magnetic force is from right hand to left hand then the direction of magnetic field is from vertical up to down.

(7) State the rule to determine the direction of a

(i) Magnetic field produced around a straight conductor-carrying current

Magnetic field produced around a straight conductor-carrying current is right hand thumb rule. Imagine that you are holding a current-carrying straight conductor in your right hand such that the thumb points towards the direction of current. Then your fingers will wrap around the conductor in the direction of the field lines of the magnetic field, This is known as the right-hand thumb rule.

(ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and

Force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it- Fleming’s left hand rule. stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.

(iii) current induced in a coil due to its rotation in a magnetic field.

Current induced in a coil due to its rotation in a magnetic field- Fleming’s right hand rule. Stretch the thumb, forefinger and middle finger of right hand so that they are perpendicular to each other. If the forefinger indicates the direction of the magnetic field and the thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current. This simple rule is called Fleming’s right-hand rule.

(8) When does an electric short circuit occur?

Short circuit happens when the current flowing through circuit is over the designed limit of circuit. It can also occur due to damage insulated wire touch to each other. Faulty appliances can also be the reason of short circuit.

(9) What is the function of an earth wire? Why is it necessary to earth metallic appliances?